I would suggest replacing your fill valve, most of the time your old valve overfills the tank because the diaphragm inside has gone bad. They are cheap and easy to replace plus added peace of mind.

The one in the video here looks similar to yours.

It appears full, so if the water is running into the center overflow pipe, you need to adjust the float arm to trigger earlier. Most have a screw for adjustment but I can't see well enough from the picture to make further recommendation.

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Besides water bill, if you get a clog the water will overflow from your bowl (happened to one of my residents)

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No more chance of a problem, definitely the best idea until it's fixed as well 👍

I found this https://www.google.com/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch%3Fv%3Da56BCuDwClU&ved=2ahUKEwjOy8Dv7IL8AhWKmGoFHalNBJUQFnoECAwQBA&usg=AOvVaw09F31bvCFa1-9bNjcvdLEO

Basically it says there is a clip to release so you can adjust the float.

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Without being there : DOWN.

The black box is likely a buoancy device/swimmer.

Water flows in, box get's "pressed" upwards. When the water raises to a certain level the box is so far up that it closes the valve. Usually over some sort of lever mechanism.

Yours isn't closing the valve completely, so water keeps flowing in and then leaves through the overflow.

Possible causes

• The box lost it's buoancy, if it is a container, it has a hole or something like that. UNLIKELY, because it more or less wouldn't work at all.

• The box lost the right position. These things can come lose and then aren't closing the valve early enough. This can be adjusted by moving it in reference to the lever system (your up/down). By moving it down, it will "swim" earlier and close the valve earlier. LIKELY cause.

• Defect O ring, the inflow valve of course contains sealants, O rings. Maybe the lever pushes it shut like it should, but still a tiny amount of water comes in. POSSIBLE you would need to change the seals or even the inner mechanism of the water box.

• The mechanism got scaled, over time a crust of minerals accumulated and prevents the valve from closing. Give a good amount of citric or vinegar acid in the water tank and let it fill (Or special anti scaling stuff) POSSIBLE

Easiest way to figure out what might be the issue:

Empty the water tank(flush) and when it keeps filling see if raising to he black box /swimmer by hand closes the valve at some point. Then you verified that all seals work and scaling is not an issue. If it doesn't close no matter if the swimmer goes up then the issue is with the valve.

I have the same valve in one of my toilets. There is a clip on the float where it attaches to the lever arm. Lower the float, and then make sure the float is not obstructed by the hose or the side of the tank as it raises. Flush the toilet after you adjust the float and see if it shuts the water off. BTW, mine seemed inconsistent with shutting off just today, so I plan to replace this valve, they do wear out or get built up with sediment. Usually only $20 +/- for replacement.

Could it be scale buildup?

You'd rather turn the water on and off 5x a day for the foreseeable future vs spending $20 on a new fill valve and 30 mins of work to fix it?

Seems like others have given the probable cause and fix. If not working with adjustment, just replace it. Not sure your locale, but my local hardware store sells a base model for $12. Or Amazon/online. Float valve is the name I believe. Easy replacement - turn off, and the disconnect water line at toilet after you flush to empty reservoir, unscrew the whole valve from underside of res (good idea to have towel/bucket for small residual water), replace and screw in new one and reattach water line. Shouldnt be more than 20mins if never done it before. Any other questions should be easy to address here. Good luck!

Just replace the fill valve. It’s super easy and some don’t even require tools. Takes like 10 minutes.

I’ve had this happen to a couple toilets and it sounds to me like your fill valve is failing.

Reach in there and lift the float manually. If the water does not shut off then the fill valve is bad. If it does shut off when you lift it then it's just a matter of adjusting it.

Some people have bathrooms that are rarely used

Fair point, I'd still rather fix it for a few bucks vs having to instruct guests how to work the toilet. Gonna be an awkward conversation if someone needs more than just one flush

I’m a handyman and I’ve never seen that kind of fill valve, the other guys are right, put in a new basic one, it will have a little finger twist knob, or a screwdriver plastic bolt to raise and lower the level of the water.Ray

If by running you mean it flushes and refills on its own every so often (called a ghost flush), try pulling that white hose out of the tube a bit.

This won't work if the fill valve has failed, and it's pretty common for that to happen on these. Sometimes it just needs to be cleaned out real quick, but often it just makes more sense to replace it.

Take the flap out and wash it with soapy water until its really clean and replace it

Try lightly tapping/jiggling the flush handle. If that works you probably just need to adjust the length of the chain connecting the flush handle to the flapper valve a touch longer.

In my experience the water valve will start leaking from the valve itself outside of the toilet . I've never had on of those valves close and not leak. I think my failure rate is 10 out of 11

I'm going to guess that the continual running is due to a worn out flapper not providing a good seal. They will wear out due to the chlorine in the water supply and there are chemical resistant models. Try putting some food coloring in the tank and see if the water is coming from the under-rim ports.